Latency Variance and Std Dev
A hard SQL mock interview question on DataDriven. Practice with AI-powered feedback, real code execution, and a hire/no-hire decision.
- Domain
- SQL
- Difficulty
- hard
- Seniority
- L3
Interview Prompt
The reliability team is profiling latency on successful API calls. For calls that returned status 200, report the mean latency, its variance, and its standard deviation.
Summary
How much does latency actually vary?
How This Interview Works
- Read the vague prompt (just like a real interview)
- Ask clarifying questions to the AI interviewer
- Write your sql solution with real code execution
- Get instant feedback and a hire/no-hire decision